Dental Materials MCQs

Page No. 2

In a high copper amalgam the phase, which is eliminated is_______________?


aGamma 1

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bGamma 2

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cGamma 1 and 2

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dNo phase is eliminated

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View Answer Gamma 2

Moisture contamination of amalgam can lead to_____________?


aMarginal breakdown

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bShrinkage

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cDelayed expansion

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dincreased stresses

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View Answer Delayed expansion

Discolouration of silver alloy is due to_____________?


aTarnish

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bTarnish and corrosion

✓


cWet corrosion

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dDry corrosion

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View Answer Tarnish and corrosion

Advantage of zinc containing amalgam is_______________?


aBetter handling property

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bDimensional Stability

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cResistance to creep

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dToxicity to pulp and dentin

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What is the working time of amalgam?


aOne to two minutes

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bThree to four minutes

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cFive to six minutes

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dSeven to eight minutes

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View Answer Three to four minutes

The percentage of copper in high copper alloy is______________?


a10-12%

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b0-6%

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c13-30%

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d20-30%

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View Answer 13-30%

How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?


a24 hours

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b1-2 days

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c3-5 days

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d7 days

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View Answer 3-5 days

What is the most frequently used restorative material ?


aSilicate

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bAmalgam

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cComposite

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dGold

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View Answer Amalgam

Which of the following silver amalgam alloy have the maximum strength________________?


aLathe cut

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bSpherical

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cAdmixed

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dSingle composition

✓


View Answer Single composition

Copper content in low copper amalgam is________________?


a6%

✓


b12%

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c29%

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d19%

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View Answer 6%

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